/*-------------------------------------------------------------------------
 *
 * parse_oper.h
 *        handle operator things for parser
 *
 *
 * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/parser/parse_oper.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PARSE_OPER_H
#define PARSE_OPER_H

#include "access/htup.h"
#include "nodes/parsenodes.h"
#include "parser/parse_node.h"


typedef HeapTuple Operator;

/* Routines to look up an operator given name and exact input type(s) */
extern Oid LookupOperName(ParseState *pstate, List *opername,
               Oid oprleft, Oid oprright,
               bool noError, int location);
extern Oid    LookupOperWithArgs(ObjectWithArgs *oper, bool noError);

/* Routines to find operators matching a name and given input types */
/* NB: the selected operator may require coercion of the input types! */
extern Operator oper(ParseState *pstate, List *op, Oid arg1, Oid arg2,
     bool noError, int location);
extern Operator right_oper(ParseState *pstate, List *op, Oid arg,
           bool noError, int location);
extern Operator left_oper(ParseState *pstate, List *op, Oid arg,
          bool noError, int location);

/* Routines to find operators that DO NOT require coercion --- ie, their */
/* input types are either exactly as given, or binary-compatible */
extern Operator compatible_oper(ParseState *pstate, List *op,
                Oid arg1, Oid arg2,
                bool noError, int location);

/* currently no need for compatible_left_oper/compatible_right_oper */

/* Routines for identifying "<", "=", ">" operators for a type */
extern void get_sort_group_operators(Oid argtype,
                         bool needLT, bool needEQ, bool needGT,
                         Oid *ltOpr, Oid *eqOpr, Oid *gtOpr,
                         bool *isHashable);

/* Convenience routines for common calls on the above */
extern Oid    compatible_oper_opid(List *op, Oid arg1, Oid arg2, bool noError);

/* Extract operator OID or underlying-function OID from an Operator tuple */
extern Oid    oprid(Operator op);
extern Oid    oprfuncid(Operator op);

/* Build expression tree for an operator invocation */
extern Expr *make_op(ParseState *pstate, List *opname,
        Node *ltree, Node *rtree, Node *last_srf, int location);
extern Expr *make_scalar_array_op(ParseState *pstate, List *opname,
                     bool useOr,
                     Node *ltree, Node *rtree, int location);

#endif                            /* PARSE_OPER_H */
